GB2170528A - Casing extender - Google Patents
Casing extender Download PDFInfo
- Publication number
- GB2170528A GB2170528A GB08501982A GB8501982A GB2170528A GB 2170528 A GB2170528 A GB 2170528A GB 08501982 A GB08501982 A GB 08501982A GB 8501982 A GB8501982 A GB 8501982A GB 2170528 A GB2170528 A GB 2170528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- casing
- extender
- tubular member
- drill hole
- void
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004606 Fillers/Extenders Substances 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 239000011800 void material Substances 0.000 abstract description 10
- 238000005553 drilling Methods 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000003129 oil well Substances 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 210000004907 gland Anatomy 0.000 description 6
- 239000004568 cement Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/14—Casing shoes for the protection of the bottom of the casing
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
In offshore oil well drilling the drill hole is lined with steel casings. These are of reducing diameter with depth and are hung one within another. As each casing hangs a preset amount below the one above before being properly seated there is a void between the lowermost casing and the bottom of the drill hole. This void collects loose debris from the drill hole wall to the detriment of the drilling action. The present invention provides an extender 6 for the casing which is slidable on the lowest casing member 2 so as to extend to a varying degree from the lowest casing. Sealing members are provided to seal the extender against the casing. The extender is fixed in a non extended position before use by shear pins 7. These pins can be severed by the application of a downward force to the extender. <IMAGE>
Description
SPECIFICATION
Casing extender
This invention relates to a casing extender.
When drilling oil wells, especially in offshore environments, the drill hole is lined with steel casings which are of reducing diameter with increasing drill hole depth. Cement is pumped between the casings and the drill hole wall to secure the casings and prevent leakage of fluid.
The casings are each hung one within another, sequentially narrower casings being applied when the drill hole has been formed sufficiently deep to allow the casing to be hung from its seating on the existing casings.
As the suspension points for the casings are preset, each successive casing terminates above the bottom of the drill hole so that it can be properly seated, and in general a void of some 35-40 feet in depth remains between the bottom of the lowermost casing and the bottom of the drill hole. This void then tends to collect loose debris from the drill hole wall.
As drilling is continued through the floor of the void area the loose debris can fall into the newlyformed drill hole behind the drill bit, causing the drill bit to jam in the hole and making it difficultforthe bit to be removed.
Also, the void is of greater diameter than the casing and the newly-formed drill hole, so that cuttings from the hole lose velocity in the void as they are pumped to the surface in entrainment with drilling mud. As a result they come out of entrainment and collect in the void, increasing the amount of down hole debris.
According to the present invention there is provided a casing extender comprising a tubular member in engagement with a casing member and movable on the casing member, the tubular member being movable on the casing member so as to extend to varying degrees beyond a lower end of the casing member, the interior of the tubular member on such extension being in communication with the interior of the casing member.
The tubular member is preferably in sliding en gagementwith the casing member, and is preferably concentric with the casing member with sealing or packing means between them to prevent flow of fluid between them.
The tubular member may be held on the casing member in an out-of-use position in which it does not extend beyond the lower end of the casing, or extends only to a limited extent beyond the lower end. The members may for example be held together in that position by means of shear pins or the like which can be severed on application of a downward force to the tubular member. Such force may be applied by means of fluid pumped against a face of the tubular member.
The extent of travel of the tubular member on the casing member may be limited by providing stop means which prevent the tubular member from leaving its engagement with the casing member.
The tubular member may carry projections or other formations on its outer face to prevent its rotation relative to the casing member, the projections being arranged to engage with fixing cement or the like which may be provided around the tubular member.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings in which
Figure lisa side sectional view of a portion of casing for use downhole and having a casing extender of this invention, and
Figures2 and 3 are enlarged portions of Figure 1.
Referring to the drawings, on which dimensions are given by way of example only, a casing 1 for insertion into a drill hole in the sea bed has a buttress threaded coupling 3 carrying a lowermost casing section 2 of 9.625" outside diameter. The casing section 2 terminates at its lower end in a bumper stop 4 which is screwed to the section 2 and protrudes radially beyond the section 2 to form a shoulder 5.
A tubular extender sleeve 6 of 10.750" outside diameter is mounted around the casing section 2 and radially spaced from it along a portion of its length. The sleeve 6 is apertured to receive shear pins 7 which pass through it into corresponding apertures in the bumper stop 4, thereby holding the sleeve 6 and section 2 together. The sleeve 6 is a sliding fit on the bumper stop 4.
At its upper end the sleeve 6 has screwed to it a packing gland 8 to which is screwed a packing follower 9. The gland 8, follower 9 and casing section 2 outer face define an annular chamber in which a chevron packing member 10 is disposed to prevent fluid flow between the gland 8 and the casing section 2. The gland 8 and follower 9 are a sliding fit on the casing section 2 and the gland 8 forms a shoulder 14 where it protrudes inwardly of the sleeve 6.
At its lower end the sleeve 6 caries through a screw connection a guide shoe 11 which has a through bore 12 of 1.5 diameter. Adjacent the shoe 11 the sleeve 6 has fins 13 extending radially from its outer face and circumferentially spaced around it.
Further fins may also be provided on the sleeve 6 adjacent the gland 8 if desired, but they are not present in this embodiment.
In use, with the shear pins 7 in place and the sleeve 6 in the position shown, the casing 1 is inserted into a drill hole and suspended from a standard mounting so that the shoe 11 is disposed about 35 to 40 feet above the bottom of the drill hole. The drill hole inevitably has loose debris accummulated in it below the shoe 11. Drilling mud is then pumped down within the casing 1 and exerts a downward force on an upwardly-directed face 14 of the shoe 11.
This causes the pins 7 to shear, releasing the sleeve 6 and causing itto move downwadly over the casing section 2 until the shoe 11 rests on the loose debris in the drill hole, thus effectively extending the length of the casing 1 to the desired depth, and preventing the formation of a void between the shoe 11 and the debris. Overextension of the sleeve 6 is prevented by the eventual engagement of the shoulders 5 and 14 at the limit of travel of the sleeve 6 on the section 2.
Cement can then be pumped down through the casing and out through theborn 12 to fill the annular space between the outer face of the casing section 2 and the drill hole wall. When the cement sets it does so around the fins 13, thus holding the sleeve 6 against rotation within the drill hole when drilling is recommenced.
When drilling restarts, drilling mud is pumped from the surface to the drill bit to entrain cuttings and carry them to the surface. The extension of the casing by means ofthe sleeve 6 prevents these cuttings from being lost from the mud flow, as the formation of a void between the casing and the bottom of the existing drill hole is prevented.
Further, it is less likely that loose debris will find its way into the newly-formed drill hole to interfere with operation and removal of the bit.
Modifications and improvement may be made without departing from the scope of the invention.
Claims (8)
1. A casing extender comprising a tubular member in engagement with a casing member and movable on said casing member so as to extend to varying degrees beyond an end of said casing member, the tubular member and the casing member each having an interior, said interiors being in communication on said extensidn of said tubular member
2. A casing extender as claimed in Claim 1, wherein the tubular member is slidable relative to the casing member
3. A casing extender as claimed in Claim 1 or 2, wherein the tubular member is concentric with the casing member.
4. A casing extender as claimed in any one of the preceding claims, wherein sealing means are provided between the casing member and the tubular member to prevent flow of fluid between the casing member and the tubular member.
5. A casing extender as claimed in any one of the preceding Claims, wherein the tubular member is locatable on the casing member in a position of least extension by shear pins extending between the tubular member and the casing member.
6. A casing extender as claimed in any one of the preceding Claims, wherein stop means are provided which limit the extension of said tubular member on said casing member.
7fA casing extender as claimed in any one of the preceding Claims, wherein an outer face of the tubular member has projections which engage with fixing means provided on the tubular member to prevent rotation of the tubular member relative to the casing member.
8. A casing extender substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08501982A GB2170528A (en) | 1985-01-26 | 1985-01-26 | Casing extender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08501982A GB2170528A (en) | 1985-01-26 | 1985-01-26 | Casing extender |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8501982D0 GB8501982D0 (en) | 1985-02-27 |
| GB2170528A true GB2170528A (en) | 1986-08-06 |
Family
ID=10573442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08501982A Withdrawn GB2170528A (en) | 1985-01-26 | 1985-01-26 | Casing extender |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2170528A (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996028635A1 (en) * | 1995-03-11 | 1996-09-19 | Enterprise Oil Plc | Improved casing shoe |
| GB2304755A (en) * | 1995-09-04 | 1997-03-26 | Weatherford Lamb | Casing shoe for oil and gas wells |
| WO1999064713A1 (en) * | 1998-06-11 | 1999-12-16 | Bbl Downhole Tools Ltd. | A drilling tool |
| US7650944B1 (en) | 2003-07-11 | 2010-01-26 | Weatherford/Lamb, Inc. | Vessel for well intervention |
| US7712523B2 (en) | 2000-04-17 | 2010-05-11 | Weatherford/Lamb, Inc. | Top drive casing system |
| US7730965B2 (en) | 2002-12-13 | 2010-06-08 | Weatherford/Lamb, Inc. | Retractable joint and cementing shoe for use in completing a wellbore |
| US7748475B2 (en) | 2004-02-19 | 2010-07-06 | Baker Hughes Incorporated | Earth boring drill bits with casing component drill out capability and methods of use |
| WO2010120567A2 (en) * | 2009-04-01 | 2010-10-21 | Baker Hughes Incorporated | Methods for forming boring shoes for wellbore casing, and boring shoes and intermediate structures formed by such methods |
| US7823665B2 (en) | 2006-08-08 | 2010-11-02 | Weatherford/Lamb, Inc. | Milling of cemented tubulars |
| US7857052B2 (en) | 2006-05-12 | 2010-12-28 | Weatherford/Lamb, Inc. | Stage cementing methods used in casing while drilling |
| US7900703B2 (en) | 2006-05-15 | 2011-03-08 | Baker Hughes Incorporated | Method of drilling out a reaming tool |
| US7938201B2 (en) | 2002-12-13 | 2011-05-10 | Weatherford/Lamb, Inc. | Deep water drilling with casing |
| US7954570B2 (en) | 2004-02-19 | 2011-06-07 | Baker Hughes Incorporated | Cutting elements configured for casing component drillout and earth boring drill bits including same |
| US7954571B2 (en) | 2007-10-02 | 2011-06-07 | Baker Hughes Incorporated | Cutting structures for casing component drillout and earth-boring drill bits including same |
| US8006785B2 (en) | 2004-02-19 | 2011-08-30 | Baker Hughes Incorporated | Casing and liner drilling bits and reamers |
| USRE42877E1 (en) | 2003-02-07 | 2011-11-01 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| WO2012059641A1 (en) * | 2010-11-03 | 2012-05-10 | Oy Atlas Copco Rotex Ab | Method and apparatus for coupling an earth pipe into the ground, using a solidifying mass. |
| US8245797B2 (en) | 2007-10-02 | 2012-08-21 | Baker Hughes Incorporated | Cutting structures for casing component drillout and earth-boring drill bits including same |
| US8276689B2 (en) | 2006-05-22 | 2012-10-02 | Weatherford/Lamb, Inc. | Methods and apparatus for drilling with casing |
-
1985
- 1985-01-26 GB GB08501982A patent/GB2170528A/en not_active Withdrawn
Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6062326A (en) * | 1995-03-11 | 2000-05-16 | Enterprise Oil Plc | Casing shoe with cutting means |
| WO1996028635A1 (en) * | 1995-03-11 | 1996-09-19 | Enterprise Oil Plc | Improved casing shoe |
| GB2304755A (en) * | 1995-09-04 | 1997-03-26 | Weatherford Lamb | Casing shoe for oil and gas wells |
| WO1999064713A1 (en) * | 1998-06-11 | 1999-12-16 | Bbl Downhole Tools Ltd. | A drilling tool |
| AU751544B2 (en) * | 1998-06-11 | 2002-08-22 | Weatherford Technology Holdings, Llc | A drilling tool |
| US6443247B1 (en) | 1998-06-11 | 2002-09-03 | Weatherford/Lamb, Inc. | Casing drilling shoe |
| US7712523B2 (en) | 2000-04-17 | 2010-05-11 | Weatherford/Lamb, Inc. | Top drive casing system |
| US7938201B2 (en) | 2002-12-13 | 2011-05-10 | Weatherford/Lamb, Inc. | Deep water drilling with casing |
| US7730965B2 (en) | 2002-12-13 | 2010-06-08 | Weatherford/Lamb, Inc. | Retractable joint and cementing shoe for use in completing a wellbore |
| USRE42877E1 (en) | 2003-02-07 | 2011-11-01 | Weatherford/Lamb, Inc. | Methods and apparatus for wellbore construction and completion |
| US7650944B1 (en) | 2003-07-11 | 2010-01-26 | Weatherford/Lamb, Inc. | Vessel for well intervention |
| US7954570B2 (en) | 2004-02-19 | 2011-06-07 | Baker Hughes Incorporated | Cutting elements configured for casing component drillout and earth boring drill bits including same |
| US8191654B2 (en) | 2004-02-19 | 2012-06-05 | Baker Hughes Incorporated | Methods of drilling using differing types of cutting elements |
| US8297380B2 (en) | 2004-02-19 | 2012-10-30 | Baker Hughes Incorporated | Casing and liner drilling shoes having integrated operational components, and related methods |
| US8006785B2 (en) | 2004-02-19 | 2011-08-30 | Baker Hughes Incorporated | Casing and liner drilling bits and reamers |
| US7748475B2 (en) | 2004-02-19 | 2010-07-06 | Baker Hughes Incorporated | Earth boring drill bits with casing component drill out capability and methods of use |
| US8225887B2 (en) | 2004-02-19 | 2012-07-24 | Baker Hughes Incorporated | Casing and liner drilling shoes with portions configured to fail responsive to pressure, and related methods |
| US8167059B2 (en) | 2004-02-19 | 2012-05-01 | Baker Hughes Incorporated | Casing and liner drilling shoes having spiral blade configurations, and related methods |
| US8225888B2 (en) | 2004-02-19 | 2012-07-24 | Baker Hughes Incorporated | Casing shoes having drillable and non-drillable cutting elements in different regions and related methods |
| US8205693B2 (en) | 2004-02-19 | 2012-06-26 | Baker Hughes Incorporated | Casing and liner drilling shoes having selected profile geometries, and related methods |
| US7857052B2 (en) | 2006-05-12 | 2010-12-28 | Weatherford/Lamb, Inc. | Stage cementing methods used in casing while drilling |
| US7900703B2 (en) | 2006-05-15 | 2011-03-08 | Baker Hughes Incorporated | Method of drilling out a reaming tool |
| US8276689B2 (en) | 2006-05-22 | 2012-10-02 | Weatherford/Lamb, Inc. | Methods and apparatus for drilling with casing |
| US7823665B2 (en) | 2006-08-08 | 2010-11-02 | Weatherford/Lamb, Inc. | Milling of cemented tubulars |
| US7954571B2 (en) | 2007-10-02 | 2011-06-07 | Baker Hughes Incorporated | Cutting structures for casing component drillout and earth-boring drill bits including same |
| US8177001B2 (en) | 2007-10-02 | 2012-05-15 | Baker Hughes Incorporated | Earth-boring tools including abrasive cutting structures and related methods |
| US8245797B2 (en) | 2007-10-02 | 2012-08-21 | Baker Hughes Incorporated | Cutting structures for casing component drillout and earth-boring drill bits including same |
| GB2480957A (en) * | 2009-04-01 | 2011-12-07 | Baker Hughes Inc | Methods for forming boring shoes for wellbore casing, and boring shoes and intermediate structures formed by such methods |
| WO2010120567A2 (en) * | 2009-04-01 | 2010-10-21 | Baker Hughes Incorporated | Methods for forming boring shoes for wellbore casing, and boring shoes and intermediate structures formed by such methods |
| WO2010120567A3 (en) * | 2009-04-01 | 2011-01-13 | Baker Hughes Incorporated | Methods for forming boring shoes for wellbore casing, and boring shoes and intermediate structures formed by such methods |
| WO2012059641A1 (en) * | 2010-11-03 | 2012-05-10 | Oy Atlas Copco Rotex Ab | Method and apparatus for coupling an earth pipe into the ground, using a solidifying mass. |
| US9175519B2 (en) | 2010-11-03 | 2015-11-03 | Oy Atlas Copco Rotex Ab | Method and apparatus for coupling an earth pipe into the ground, using a solidifying mass |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8501982D0 (en) | 1985-02-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |